(ω(i,j,k,l)=exp(-(((((i-k))^2)+(((j-l))^2))/(2(Subscript[σ, d]^2)))-(((\[LeftDoubleBracketingBar](Subscript[f, c])(i,j)-(Subscript[f, c])(k,l)\[RightDoubleBracketingBar])^2)/(2(Subscript[σ, r]^2))))(2))